642321239 has 16 divisors (see below), whose sum is σ = 773422080. Its totient is φ = 521108640.

The previous prime is 642321227. The next prime is 642321301. The reversal of 642321239 is 932123246.

It is a cyclic number.

It is not a de Polignac number, because 642321239 - 2⁸ = 642320983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642321139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273209 + ... + 275549.

It is an arithmetic number, because the mean of its divisors is an integer number (48338880).

Almost surely, 2^642321239 is an apocalyptic number.

642321239 is a deficient number, since it is larger than the sum of its proper divisors (131100841).

642321239 is a wasteful number, since it uses less digits than its factorization.

642321239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430.

The product of its digits is 15552, while the sum is 32.

The square root of 642321239 is about 25344.0572718734. The cubic root of 642321239 is about 862.8144851643.

The spelling of 642321239 in words is "six hundred forty-two million, three hundred twenty-one thousand, two hundred thirty-nine".